Calculates ages and propagates their analytical uncertainties.
age(x, ...)# S3 method for default
age(x, method = "U238-Pb206", exterr = TRUE, J = c(NA,
NA), zeta = c(NA, NA), rhoD = c(NA, NA), ...)
# S3 method for UPb
age(x, type = 1, wetherill = TRUE, exterr = TRUE, i = NA,
sigdig = NA, ...)
# S3 method for PbPb
age(x, isochron = TRUE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
# S3 method for ArAr
age(x, isochron = FALSE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
# S3 method for UThHe
age(x, central = FALSE, i = NA, sigdig = NA, ...)
# S3 method for fissiontracks
age(x, central = FALSE, i = NA, sigdig = NA,
exterr = TRUE, ...)
# S3 method for ReOs
age(x, isochron = TRUE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
# S3 method for SmNd
age(x, isochron = TRUE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
# S3 method for RbSr
age(x, isochron = TRUE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
# S3 method for LuHf
age(x, isochron = TRUE, i2i = TRUE, exterr = TRUE,
i = NA, sigdig = NA, ...)
can be:
a scalar containing an isotopic ratio,
a two element vector containing an isotopic ratio and its standard
error, or the spontaneous and induced track densities Ns and
Ni (if method='fissiontracks'),
a four element vector containing Ar40Ar39,
s[Ar40Ar39], J, s[J],
a six element vector containing U, s[U], Th,
s[Th], He and s[He],
an eight element vector containing U, s[U],
Th, s[Th], He, s[He], Sm and
s[Sm]
a six element vector containing Rb, s[Rb],
Sr, s[Sr], Sr87Sr86, and s[Sr87Sr86]
a six element vector containing Re, s[Re],
Os, s[Os], Os187Os188, and s[Os187Os188]
a six element vector containing Sm, s[Sm],
Nd, s[Nd], Nd143Nd144, and s[Nd144Nd143]
a six element vector containing Lu, s[Lu],
Hf, s[Hf], Hf176Hf177, and s[Hf176Hf177]
OR
an object of class UPb, PbPb, ArAr,
RbSr, SmNd, ReOs, LuHf UThHe or
fissiontracks.
additional arguments
one of either 'U238-Pb206', 'U235-Pb207',
'Pb207-Pb206', 'Ar-Ar', 'Re-Os',
'Sm-Nd', 'Rb-Sr', 'Lu-Hf', 'U-Th-He' or
'fissiontracks'
propagate the external (decay constant and calibration factor) uncertainties?
two-element vector with the J-factor and its standard error.
two-element vector with the zeta-factor and its standard error.
two-element vector with the track density of the dosimeter glass and its standard error.
scalar flag indicating whether each U-Pb analysis
should be considered separately (type=1), a
concordia age should be calculated from all U-Pb analyses
together (type=2), or a discordia line should be
fit through all the U-Pb analyses (type=3).
logical flag to indicate whether the data should
be evaluated in Wetherill (TRUE) or Tera-Wasserburg
(FALSE) space. This option is only used when
type=2
(optional) index of a particular aliquot
number of significant digits for the uncertainty
estimate (only used if type=1, isochron=FALSE
or central=FALSE).
logical flag indicating whether each Ar-Ar analysis
should be considered separately (isochron=FALSE) or an
isochron age should be calculated from all Ar-Ar analyses
together (isochron=TRUE).
`isochron to intercept': calculates the initial (aka
`inherited', `excess', or `common')
\(^{40}\)Ar/\(^{36}\)Ar, \(^{207}\)Pb/\(^{204}\)Pb,
\(^{87}\)Sr/\(^{86}\)Sr, \(^{143}\)Nd/\(^{144}\)Nd,
\(^{187}\)Os/\(^{188}\)Os or \(^{176}\)Hf/\(^{177}\)Hf
ratio from an isochron fit. Setting i2i to FALSE
uses the default values stored in settings('iratio',...)
or zero (for the Pb-Pb method).
logical flag indicating whether each U-Th-He analysis
should be considered separately (central=FALSE) or a
central age should be calculated from all U-Th-He analyses
together (central=TRUE).
if x is a scalar or a vector, returns the age using
the geochronometer given by method and its standard error.
if x has class UPb and type=1,
returns a table with the following columns: t.75,
err[t.75], t.68, err[t.68], t.76,
err[t.76], t.conc, err[t.conc], containing the
\(^{207}\)Pb/\(^{235}\)U-age and standard error, the
\(^{206}\)Pb/\(^{238}\)U-age and standard error, the
\(^{207}\)Pb/\(^{206}\)Pb-age and standard error, and the
concordia age and standard error, respectively.
if x has class UPb and type=2,
returns a list with the following items:
a named vector with the (weighted mean) U-Pb composition
the covariance matrix of the (mean) U-Pb composition
the concordia age (in Ma)
the standard error of the concordia age
a list with two items (equivalence and
concordance) containing the MSWD (Mean of the Squared
Weighted Deviates, a.k.a the reduced Chi-squared statistic outside
of geochronology) of isotopic equivalence and age concordance,
respectively.
a list with two items (equivalence and
concordance) containing the p-value of the Chi-square test
for isotopic equivalence and age concordance, respectively.
if x has class UPb and type=3,
returns a list with the following items:
a two element vector with the upper and lower intercept
ages (if wetherill=TRUE) or the lower intercept age and
\(^{207}\)Pb/\(^{206}\)Pb intercept (for Tera-Wasserburg)
the covariance matrix of the elements in x
if x has class PbPb, ArAr, RbSr, SmNd,
ReOs, LuHf and isochron=FALSE, returns a table of Pb-Pb,
Ar-Ar, Rb-Sr, Sm-Nd, Re-Os or Lu-Hf ages and standard errors.
if x has class PbPb, ArAr, RbSr,
SmNd, ReOs or LuHf and isochron=TRUE,
returns a list with the following items:
the intercept of the straight line fit and its standard error.
the slope of the fit and its standard error.
the atmospheric \(^{40}\)Ar/\(^{36}\)Ar or initial \(^{207}\)Pb/\(^{204}\)Pb, \(^{187}\)Os/\(^{188}\)Os, \(^{87}\)Sr/\(^{86}\)Sr, \(^{143}\)Nd/\(^{144}\)Nd or \(^{176}\)Hf/\(^{177}\)Hf ratio and its standard error.
the \(^{207}\)Pb/\(^{206}\)Pb, \(^{40}\)Ar/\(^{39}\)Ar, \(^{187}\)Os/\(^{187}\)Re, \(^{87}\)Sr/\(^{86}\)Sr, \(^{143}\)Nd/\(^{144}\)Nd or \(^{176}\)Hf/\(^{177}\)Hf age and its standard error.
if x has class UThHe and central=FALSE,
returns a table of U-Th-He ages and standard errors.
if x has class UThHe and central=TRUE,
returns a list with the following items:
a three-element list with the weighted mean log[U/He], log[Th/He] and log[Sm/He] compositions.
a 3x3 covariance matrix for uvw
the reduced Chi-square value for the log[U/He]-log[Th/He] compositions.
the p-value of concordance between the log[U/He]-log[Th/He] compositions.
two-element vector with the central age and its standard error.
if x has class fissiontracks and
central=FALSE, returns a table of fission track ages and
standard errors.
if x has class fissiontracks and
central=TRUE, returns a list with the following items:
the reduced Chi-square value for the fission track ages.
the p-value of concordance between the fission track ages.
a two-element vector with the central age and its standard error.
the (over)dispersion of the single grain ages beyond the formal analytical uncertainties.
# NOT RUN {
data(examples)
print(age(examples$UPb))
print(age(examples$UPb,type=1))
print(age(examples$UPb,type=2))
# }
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